If you take the time to learn about training philosophies in running you will undoubtedly come across the notion of running at different paces. I believe it was Jack Daniel’s that gave names to some or all of these paces. There’s threshold, repetition, marathon, marathon goal, easy, recovery, etc. I propose the addition of the V pace and A pace.
V threshold is the vomit threshold. If you push any harder reverse peristalsis is imminent.
A pace is aggression or anger threshold. You run at this pace to get rid of aggression. Any slower and you’ll still be angry. The speed, like V threshold, varies based on weather conditions and many other factors. A threshold is generally run for a shorter distance at a pace very close to the traditional “T” pace (tempo).